linux-kernel - [syzbot] WARNING: still has locks held in io_sq

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Date:   Mon, 29 Mar 2021 00:34:18 -0700
From:   syzbot <syzbot+796d767eb376810256f5@...kaller.appspotmail.com>
To:     asml.silence@...il.com, axboe@...nel.dk, io-uring@...r.kernel.org,
        linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: [syzbot] WARNING: still has locks held in io_sq_thread

Hello,

syzbot found the following issue on:

HEAD commit:    81b1d39f Merge tag '5.12-rc4-smb3' of git://git.samba.org/..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=10fcce62d00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=d4e9addca54f3b44
dashboard link: https://syzkaller.appspot.com/bug?extid=796d767eb376810256f5
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=17d06ddcd00000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=150764bed00000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+796d767eb376810256f5@...kaller.appspotmail.com

====================================
WARNING: iou-sqp-8386/8387 still has locks held!
5.12.0-rc4-syzkaller #0 Not tainted
------------------------------------
1 lock held by iou-sqp-8386/8387:
 #0: ffff88801e1d2470 (&sqd->lock){+.+.}-{3:3}, at: io_sq_thread+0x24c/0x13a0 fs/io_uring.c:6731

stack backtrace:
CPU: 1 PID: 8387 Comm: iou-sqp-8386 Not tainted 5.12.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x141/0x1d7 lib/dump_stack.c:120
 try_to_freeze include/linux/freezer.h:66 [inline]
 get_signal+0x171a/0x2150 kernel/signal.c:2576
 io_sq_thread+0x8d2/0x13a0 fs/io_uring.c:6748

---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@...glegroups.com.

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